Gas hob



FIG. 1 is a perspective view of a gas hob showing my ornamental design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front plan view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right view thereof; and,

FIG. 6 is a left view thereof. 

The ornamental design for a gas hob, as shown and described. 